Doctor Who follows the travels of the mysterious alien known only as The Doctor. Armed with a vast intellect and unending curiosity, The Doctor travels through the infinite reaches of space and time and involves himself in the lives and travails of men, women, children, robots and aliens alike. Commonly joined by a human companion, The Doctor tries to do right by those he crosses paths with...or at the very least fix the mess caused by his arrival. With the ability to regenerate upon his death, The Doctor has existed for over 900 years as he attempts to make up for past transgressions at his hands and the hands of Time Lords like him. Along the way, he learns the meaning of fear, love and the pleasure of fish fingers and custard.